Malicious PDF — malware analysis report

Static analysis result for SHA-256 12db3747e17dc15e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 03:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f07f60ac19bc5db5c6935638c3df817a SHA-1: d156677199219050a60d312c37456c7c4b641385 SHA-256: 12db3747e17dc15ea6358eb7fbd9c5b0f7b6f63f745be216e63fbeb2e4f9d9fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including a link farm hosted on compromised CMS upload storage and disposable hosting. The embedded JavaScript and the nature of the URLs suggest an intent to redirect users to malicious sites, likely for phishing or to download further malware. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=3d+theme+for+android PDF link annotation
    • http://porpora.group/imagenes/imagenes_contenidos///12804774719.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149456121289---30520216551.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/vixosukimasiwavazeweni.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7eee65f3884e58d09a7fc0b4caf7cecd/59516169180.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/zakoxivagafuwetugirare.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/16634828087.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/bupelele.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/xigariro.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/2716782609.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/xupuw.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/60340360368.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/firirokobapotizizuf.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/29756076315.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/fuduz.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/kobexenimivosomafakawo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5b36e588---17149055847.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/18011988241.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/85169537048.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/78797645051.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/gukasixujogazizojojowoxot.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d59fc5e48---molel.pdfIn PDF document text
    • https://signika.pl/Upload/file/wunatopadanuxi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613995c11df73---43184718287.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/gusovazekaf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 10480 bytes
SHA-256: cc8e56294e978fe1a51adf16eedb0b5121ad5e33d12b9b63709fadaca2cbad71
font_01_sfnt_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 16824 bytes
SHA-256: 2cf3a237fbb300952452bada340cd14cd5d82beb86feb9a21d4f0adb0ac2a703
font_02_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1